Method of quantizing line spectral frequencies when calculating

Details Method of quantizing line spectral frequencies when calculating Method of quantizing line spectral frequencies when calculating

1992-01-03

1993-08-03

Shaw, Dale M.

Electrical audio signal processing systems and devices

One-way audio signal program distribution

Public address system

381 31, 381 36, G10L 302, G10L 500

Patent

active

052336590

ABSTRACT:
A method of quantizing the line spectral frequencies (LSF) when calculating the parameters of an analysis filter is included in a linear predictive coding (LPC) speech coder. The line spectral frequencies form an alternative to the filter parameters with unambiguous correspondence. Sum polynomials (P) and difference polynomials (Q) are constructed from the direct form coefficients of filters. Thereafter, the roots of the polynomials which correspond to the line spectral frequencies are determined, without calculation, by examining the polynomials in light of pre-selected test frequencies (f.sub.tp1, f.sub.tqf1, f.sub.tp2, f.sub.tq2, . . . ) that are speech typical. The polarity of the two polynomials (P, Q) is investigated for each of these test frequencies. When a polarity change occurs between two test frequencies, one of these frequencies, such as the higher frequency, is chosen. The chosen frequency gives a given root (p1 and q1 respectively) of the respective sum and difference polynomial (P and Q), and therewith a line spectral frequency (LSF1 and LSF2 respectively).

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P. Kabal et al., "The Computation of Line Spectral Frequencies Using Chebyshev Polynomials," IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-34, No. 6, Dec. 1986.

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